I had the opportunity to meet some people during IDEF 19 defense expo and according to the intended main contractor, STM's representitive present there, TF-2000's full displacement should be well over 8000 tons. The preliminary report suggests it will have at least 64-cell VLS system but the design phase still goes on.
The first ship should be laid down by mid-2024, right after Pakistan's 3rd ship's launch but we can't be sure until the contract phase.
Considering how long it's taking Turkey to build Milgem for Pakistan, I wouldn't be surprised if it takes 10 years for Turkey to build its first Istanbul class frigate and even longer to build a TF-2000 frigate.